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United States Patent Ofiice Patent, 373511:

wherein X represents the radical of an aromatic amine, of

2,766,239 good stability to subsequent treatment in cold Javelle OPTICAL BRIGHTENING AGENTS OF THE water. The brightening agents of the invention are readily STILBENE SERIES soluble and have a strong optical brightening action, im-

parting a bluish fluorescence to substrata treated there- Fritz Fleck, Basel, Switzerland, assign or to Sandoz A. G-, with. The treatment of the materials to be optically Basel, Switzerland 3 SWISS brightened can take place in a wide variety of ways such No Drawing Application September 3, 1954, e. g. as in a preparation process, a purification process serial No. 454,235 or a washing process or the hire. For instance, in the Claims riomy a cation Switzerland treatment of viscose artificial silk, it may take place by P p g 16 1953 addition of the brightening agent to the spinning mass;

in the treatment of material such as cellulose fibers, it

2 Claims. (Cl. 260249.6) may be carried out by addition of the brightening agent to the washing or rinsing bath; in the case of paper it may The present invemicn relates to optical brightening be carried out in the mixing operation in the hollander agents f h ilb Series, or by spraying onto the finished paper web, etc. Wetting According to the present invention valuable optical agents, detifgehts dispersing agents y be added to brightening agents are obtained when cyanuric chloride The new brightfihefs, 0f the latter y bfi uSBd in a s or cyanuric bromide is reacted in any desired order of which cohtaih Surface-active Compoundssuccession with (a) 4,4-diaminostilbene-2-2-disulfonic 29 The following @Xamples Set forth represfintative id or a l thereof (b) 1 j 2 and (c) bodiments of the invention which, however, is not inammonia and/or a primary aromatic amine in Such tended to be restricted thereto. In the examples, the quantities as primarily to produce a compound of the Parts and Percentages are by g thfi temperatures f l are in degrees Centigrade. The monoisopropanolamine OH3-CHCII2NH-C C-NH- OH=CHONHCIJ (||]NHCHQOHCHI H i; N N on om Moss C C it it wherein M represents a cation and X represents -NH2 employed in the examples is technical P 1 or the radical of a primary aromatic amine. I101, Which can hfi P p from P py Oxide and It is preferred to start from two mols of cyanuric chloammoniaride or two mols of cyanuric bromide, one mol of 4,4'- Example 1 diaminostilbene-2,2'-disulfonic acid, or a salt thereof, two mols of l-amino-2-propanol and two mols of an aromatic A solution of 194 parts of cyanuric chloride in 1000 amine, such as aniline, toluidine, amidine, etc., or of a parts of acetone is run into 2000 parts of ice water, stirring sulfonic acid of such aromatic amine. The aromatic thoroughly. To the resultant fine suspension of cyanuric amine may be replaced, wholly or in part, by ammonia. 4r chloride there is run in the course of 30 minutes at 05 It is advantageous to suspend the cyanuric chloride or the a solution of 207 parts of sodium-4,4'-diaminostilbenesimilarly reacting cyanuric bromide in water with the aid 2,2' disulfonate in 1500 parts of water. Then 530 parts of of an organic solvent such as acetone, and to carry out a 10% aqueous sodium carbonate solution are added in the reaction with the first amine at a temperature between the course of 30 minutes, at the end of which time free 0 and 20 0, preferably between 0 and 5 C., then with amino groups should no longer be detectable in a test the second amine at a temperature between 20 and L15 Specimen. The resultant sodium-4,4'-bis-(2,4-dichloro- C., and finally with the third amine at a temperature l,3,5-triazyl-(6)-amino)-stilbene 2,2 disulfonate prebetween and 100 C., neutralizing the liberated hydrocipitates in a fine state of sub-division. chloric acid by means of an alkali metal hydroxide, car- A solution of 164 parts of m-chloranilinc-hydrochlobonate or acetate or even with an excess of the starting ride in 500 parts of water is then added in the course of amine or ammonia. In the event that the amine or the so 10 minutes at 5l0, after which the mixture is heated ammonia are employed in the form of their salts, it is to 40, at which temperature 1060 parts of a 10% aqueous advisable to use an increased quantity of alkali metal sodium carbonate solution are stirred in, in the course hydroxide or other acid-binding agent in order to mainof 2 and A1 hours. 83 parts of monoisopropanolamine tain the desired pH. dissolved in 250 parts of water are then added. The The soobtained brightening agents possess particularly 55 temperature is raised to 95, whereupon the acetone good afi'lnity for vegetable fibers such as cotton, linen, distils off. Then, in the course of 3 hours, 530 parts of regenerated cellulose, cellulose, paper, etc., as well as a 10% solium carbonate solution are stirred in, the reacfor animal fibers such as wool, etc., and for synthetic tion mixture is diluted with 8000 parts of water, filtered fibers, for example, polyamide fibers such as nylon, etc. hot, and sodium-bis-(Z-m-chloranilino-4-monoisopropa- The brightening eflect produced on the various sub- (30 nolamine-l,3,5-triazyl-(6)amino) stilbene 2,2 disulstrata is, particularly when use is made of derivatives fonate of the formula W CHaOHOH NH-O C-NH CH=CH NHC CNHCH;CHCH

H 11: 1% N H I NEOIS O O I l'H Iil'H G1 Ol 3 separated from the filtrate by salting out with 1400 parts of sodium chloride, filtered off, washed with sodium chloride solution and dried at 60. The product is a light yellow, solid, pulverizable substance.

Example 2 A solution of 194 parts of cyanuric chloride in 1200 parts of acetone is run, in the course of 30 minutes at 4 C. and while stirring vigorously, into a solution of 207 parts of sodium-4,4-diaminostilbene-2,2'-disulfonaite. Then 400 parts of a 10% solution of aqueous caustic soda are added slowly and, after all free amino groups have disappeared, there is rapidly added a solution of 173 parts of metanilic acid in 500 parts of water, which solution has been neutralized to a pH of 7 by means of 55 parts of calcined sodium carbonate: the mixture is then stirred at 40 for 2 hours. During this stirring, 53 parts of calcined sodium carbonate dissolved in 500 parts of water are added. Then a solution of 83 parts of monoisopropanolamine in 250 parts of water is added, the mixture heated for 3 hours to 9095, whereupon acetone distils 011?, and the pH value maintained at between 7 and 8 by the addition of 400 parts of 10% aqueous caustic soda solution. A clear solution thus results. The latter is filtered and the filtrate is evaporated to dryness under reduced pressure. The resultant sodium-4,4-bis-(Z-m-sulfoanilino-4-monoisopropanolamino-1,3,5-triazyl (6) amino)-stilbene-2,2'-disulfonate of the formula Example 3 The process according to Example 2 is repeated except that the metanilic acid is replaced by the same amount of sulfanilic acid, and there is thus obtained the sodium- 4,4 bis (Z-p-sulfo-anilino 4 monoisopropanolamino- 1,3,5 triazyl -(6)- amino)-stilbene-2,2'-disulfonate of the formula as a sodium chloride-containing, light yellow powder of good solubility in water.

Example 4 A solution of 203 parts of o-anisidine-4-sulfo11ic acid and 53 parts of calcined sodium carbonate in 500 parts of water is added in the course of 30 minutes and at a temperature of 10 to the suspension, prepared according to Example 1, of 412 parts of sodium-bis-(2,4-dichlorol,3,S-triazylamino)-stilbene-2,2'-disulfonate. The mixture is stirred for 3 hours at 40, while gradually adding 800 parts of a aqueous solution of caustic soda until all free amino groups have disappeared. 83 parts of monoisopropanolamine are then added, and stirring is continued for 3 more hours at 9095. The acetone distils off and the mixture becomes clear. 400 parts of a 10% aqueous caustic soda solution are then added in the course of 3 hours. The solution is filtered and evaporated to dryness under reduced pressure. The obtained sodium-bis- [2 (2"methoxy-5 sulfo) aniline-4 monoisopropanob is obtained as a sodium chloride-containing, light yellow 09 amino-1,3,5-triazyl-(6)-amino] stilbene-2,2'-disulfonate powder of very good solubility in water.

is a light yellow powder of good solubility in water.

The 203 parts of o-anisidinet-sulfonic acid can be replaced by 303 parts of Z-naphthylamine-G-S-disulfonic acid, whereupon the product will correspond to the formula i NH Example 5 1,3,5-triazyl-(6)amino] -stilbene-Q,2'-disulfonate of the formula is obtained in the form of a light yellow product of good solubility in water and good fastness to light.

Example 7 The process according to Example 5 is repeated, except that 175 parts of o-anisidine hydrochloride are used instead of 142 parts of aniline hydrochloride. A brightening agent similar to that of Example 5 and corresponding to the formula C r 11TH lYIH OCH; OCH;

aqueous sodium carbonate solution. There is then added is obtained. a solution of 142 parts of aniline hydrochloride in 200 Example 8 parts of water, and the mixture stirred for 3 hours at 90 while gradually adding 800 parts of a 10% aqueous caustic soda solution. After diluting the mass with 3000 parts of hot water, it is filtered and the sodium'bis-[2anilino- 4-monoisopropanolamino 1,3,5 triazyl-(6)-amino] -stilbene-2,2-disulfona te of the formula 75 parts of monoisopropanolaminc are added in the 50 course of minutes and at 0-5" to a suspension of 412 parts of sodium-bis-[2,4 dichloro 1,3,5 triazyl (6) amino]-stilbene-2,2-disulfonate in 200 parts of water. Then, again in the course of 30 minutes, 400 parts of a 10% aqueous caustic soda are added. Thereupon a soluis precipitated by selting out with 150 parts of sodium chloride, after which it is filtered off and dried. It is a light yellow powder.

Example 6 If while otherwise proceeding according to Example 5, the 142 parts of aniline hydrochloride are replaced by 250 parts of an approximately 20% aqueous ammonia solution, sodium bis-[Z-monoisopropanolamino 4 aminotion of '207 parts of sodium-4,4-diaminostilbene-2,2- disulfonate in 1500 parts of water is rapidly stirred in. Stirring is continued at 40, with gradual addition of 400 parts of 10% aqueous caustic soda, until primary amino groups can no longer be detected. Finally, a solution of 142 parts of aniline hydrochloride in 500 parts of water is added and the mixture is heated for 3 hours at -95 while gradually adding 800 parts of a 10% aqueous caustic soda solution.

Example 9 is also within the scope of the invention to replace the Na cations by other cations such as potassium, lithium, Bleached cotton is treated for 2030 minutes at 35-40 volatile nitrogen containing bases, especially tertiary in a bath containing per litre 5 mg. of the compound preamines. Thus, instead of starting with the sodium salt in pared according to Example 6 and 12.5 g. of sodium sul- 5 the various illustrative examples, this may be replaced fate, the bath ratio being 1:40. The cotton is centrifuged for instance with the corresponding potassium or other without having been rinsed and then dried in the usual appropriate salt, whereby the final product will comprise manner. the corresponding cation.

The cotton treated in such a bath appears mulch whiter Having thus disclosed the invention what is claimed is: than the untreated one. 10 l. A compound of the formula oH, oH cn1-NB-c e-NH CH=CH Nn o CNHCH=CH0H| (in N 141 N i (in a 0|M M0; r r 1|\IH NH While the foregoing examples related to the sodium whereinM isacation including hydrogen. disulfonates, since these are the preferred derivatives, it 2. Acompound of the formula /N /N\ CII;-'(IIH*CIIXNH-?/ iCANH CH=CH NH-(;J (HI-NHCHQ*(I"JHACH OH N N N N on SOiNa NaO S r r NH NIl References Cited in the file of this patent UNITED STATES PATENTS 1,058,686 France Mar. 18. 1954 

1. A COMPOUND OF THE FORMULA 